Mac Says,"Mac's Prop Savers really work ! They protect props, skegs, and marine life. Cheap insurance when considering cost of props & skegs. What could be better?So whether you have a Johnson or Evinrude Outboard, Mercury or Mariner Outboard, Yamaha Outboard, Suzuki Outboard, Honda Outboard or any other outboard motor or Volvo or Mercruiser sterndrive this is the only protection your prop and skeg will ever need! "Satisfaction Guaranteed!